Bridge.



D. B. LUTEN.

BRIDGE. 7 APPLICATION FILED JULY 26. 19H.

1,186,1 10 V Pafented June 6,1916.

ATTORNEY.

UNITED STATES PATENT orrrcn DANIEI; LUIEN, OF INDIANAPOLIS, INDIANA.

BRIDGE.

Original application filed November 1, 1906, Serial No. 341,605.

Specification of Letters Patent.

Patented June 6, 1916.

Divided and application filed March 29,

1909, Serial No. 486,645. Divided and this application filed July 26, 1911. Serial No. 640,711.

To all whom it may concern: I

Be it known that I, DANIEL LUTEN, a citizen of the United States, residing at Indianapolis, in the county of Marion and State of Indiana, have invented a. new and useful Im n-ovement in Bridges, of which the folthat they will not injuriously affect the strength or appearance of the structure; and

- to provide such improvements in details and methods of construction as shall hereinafter be pointed out. This application is a division of an application filed by me March 29, 1909, Serial No. 486,645,'which is a division of an application filed by me November 1, 1906, Serial No. 341,605.

The invention is illustrated in the accompanying drawings in which the same reference characters describe like parts throughout the several views.

Figure 1 is a longitudinal section of a concrete bridge; and Fig. 2 is a transverse section illustrating my improvement.

The abutments 20 and piers 21 are built to the springing lines 8 and centering is then erected for one of the arches at the middle of the axis thereof, the centering being wide enough to support a ring of reasonable width. The concrete is laid upon this centering forming a ring R. Additional arch rings R may then be produced in the same manner and allowed to set, the operation be ing repeated as many times as may be necessary to complete the span to a point close to the spandrel wall. The end rings of the arch and spandrel walls are then formed together, thus bring,- ing the joint 22 in the intrados of the arch instead of in the end face of the structure. The usual construction has hitherto been to build the arch rings complete and then' place the spandrel walls upon the arch ring, re sulting in an unsightly joint along the ex trades of the arch in the face of the wall. It is almost impossible to prevent such a joint from showing a ragged appearance, and seepage from the earth fill penetrates through it thus discoloring the face of the arch. These objectionable features are eliminated by my improved method which places the joint between the spandrel and the main portion of the arch ring, in the intrados of the arch where it is barely visible. By this means the joints in the arch are made parallel to the lines of thrust, the

arch proper being divided into longitudinal rings as by vertical planes parallel to the central line ofthe roadway. The spandrels or side walls aremonolithic with the extreme rings, joints occuring only between this extreme ring and its neighbor and at the expansion joints, which may be of any usual form, as simpl a vertical plane joint transverse to the wa lnear the ends of the span. .Thus the entire arch may be divided into rings and sections such that each one may be concreted continuously during a working day, and the construction discontinned at night at the joints as indicated. I claim 1. That improvement in the art of building a concrete arch supporting a spandrel wall, comprising erecting the arch in longitudinal sections, and concreting the span drel wall monolithically with its support ing arch section, one arch section being allowed to harden before construction of the other.

2. That improvement in the art of building an 'arch comprising building a longitudinal section of the arch, allowing the same to harden, and then facing the same with a longitudinal arch section supporting a spandrel integral therewith.

3. The improvement in the art of building a concrete arch supporting a spandrel Wall, comprising erecting the arch in mono lithic longitudinal sections, and concreting the spandrel wall monolithically with the arch section supporting it, .one arch. section ing a concrete arch, comprising erecting monolithically a longitudinal section of the arch, allowing it to harden, then erecting monolithically one or more longitudinal arch sections at each side of the hardened arch section, and forming a spandrel Wall forming such Hst section and the spandrel monoiithically with the last section so erect- Wall supported thereby as a monolith. ed at each side. In witness whereof I, have hereunto set 6. That improvement in the art of louildmy hand and seal at Indianapolis, Indiana, 5 ing a concrete arch, comprising erecting a this 20th day of July, A. D. one thousand 5 longitudinal section of the arch, allowing it nine hundred and eleven.

to harden, then erecting one or more 1on-- DANIEL B, LUTEN. [L.s.] gitudinal arch sections at each side of the Witnesses: hardened arch section, erecting a spandrel MAY LAYDEN,

10 wall on the last section at each side, and FRANK A. FAHLE.

Copies of this patent may be detained for five cents each, by addressing the Commissioner ct Patents, Washington, D. C. 

